Drilling attachment



H. L. WARNER. DRILLING ATTACHMENT.

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H L WARNER DRILLING ATTACHMENT.

Patented June 22,1897.

Hwqflv Wan/mm am fi Attorney UNITED STATES,

PATENT Erica.

HUGH L. WARNER, OF HAMILTON, OHIO.

DRILLING ATTACHMENT.

SPECIFICATION forming part of Letters Patent No. 584,910, dated June 22, 1897. Application filed June 29, 1896. Renewed April 26, 1897. Serial No. 634,025 (No model.)

To all whom, it may concern:

Be it known that I, HUGH L. WVARNER, of Hamilton, Butler county, Ohio, have invented certain new and useful Improvements in Drilling Attachments, of which the following is a specification.

This invention pertains to attachments to single-spindle drilling-machines to readily adapt such machines for the drilling at one time of a number of holes arranged in regular or irregular groups and to permit convenient changes in the relative disposition of the drills to suit changes in the groupings of the holes to be drilled.

My attachment will be found of special value in drilling the spoke-holes in the flanges of the hubs of bicycle-wheels and for similar drilling in articles where a number of small holes are grouped very close together.

There is in common use a class of drillingmachines known as sensitive drills, arranged with one drilling-spindle and with suitable feeding devices. My drilling attachment readily lends itself to use in connection with these sensitive drills, the attachment being capable of instant application and of ready removal, so as to leave the machine in its normal condition.

My improved drilling attachment will be readily understood from the following description, taken in connection with the accompanying drawings, in which- Figure 1 is a side elevation of a drilling attachment exemplifying my invention when embodied in a form suited for the drilling of the full circle of spoke-holes in the flange of a bicycle-hub; Fig. 2, a vertical diametrical section of the lower portion of the same; Fig. 3, a plan of the lower portion of the attachment; Fig. 4, a side elevation of the attachment shown in connection with the drillingspindle and work-table of an ordinary sensitive drill, the parts being shown in connection with a bicycle-hub being drilled ,Fig. 5, a vertical diametrical section of an ordinary bicycle-hub shown in connection with the templet, which may form part of my drilling attachment; Fig. 6, a vertical diamotrical section of a bushing for the templet to adapt the templet to the smaller end of the hub to be drilled; and Fig. '7, a vertical diametrical section of the spindle-bearings in connection with the templet and part of a bicycle-hub, this view illustrating a steadying work-guide.

In the drawings, l-indicates the usual table of the ordinary drilling-machine; 2, a bicycle-hub standing thereon to have the spokeholes drilled in its upper flange; 3, the usual spindle of the drilling-machine; 4, the usual feed-sleeve of the drilling-machine; 5, the usual bracket-arm of the drilling-machine; 6, the usual feed-lever of the drilling-machine; 7, a housing adapt-ed to be secured to the lower end of sleeve L and to support below the socket of the drill-spindle a group of vertical bearings for the multiple drill-spindles; S, a split clamp formed on the upper end of the housing 7 and exemplifying convenient means for readily securing the housing rigidly to sleeve 4; 9, a hollow hub carried rigidly by the lower end of housing 7, this hub being disposed in axial line with and a distance below the socket in the lower end of the drill-spindle of the drilling-machine; 10, a disk removably but rigidly secured in the upper end of hub 9 and provided with a multiplicity of vertical apertures disposed relative to each other according to the grouping of the holes which are to be drilled, the group in the illustration being a complete circular series, suited to the usual disposition of the spoke-holes in a bicyclehub; 11, a corresponding disk removably secured, in the lower end of the hub 9; 12, the multiple drillspindles, finding their bearings in the vertical apertures in the disks l0 and 11, the bodies of these multiple spindles being plain, so as to be capable of ready insertion and removal into and from their bearings in the disks, each of these multiple drill-spindles having a socket in its lower end to receive the shank of its drill; 13, the drills, with their shanks secured in the sockets of the spindles 12 by being soldered therein, the drill and its spindle then forming an integral structure; 14, a templet in the form of a ring pierced with holes engaging the lower end of the drills, this templethaving an aperture adapted to fit upon the bicycle-hub at its larger end, as seen in Fig. 5; 15, studs, several in number, distributed around the templet 14: and having their lower ends secured to the templet, the upper portion of these studs sliding in guide-holes in disk 11, heads on the upper ends of the studs limiting the drop of the templet with reference to the spindles and drills, the preference being that the drills normally project little if any beyond the lower face of the templet; 16, helical springs surrounding the studs 15 between the templet and the disk 11 and holding the templet to its extreme downward position, but permitting it to yield upwardly upon the drills; 17, a crank formed upon the upper end of each of the multiple drill-spindles, all of the cranks being uniform in throw, the crank-pins projecting upwardly and having, preferably, hemispherical ends; 18, a disk resting upon the crank-pins of the multiple drill-spindles and having in its lower face a bearing for each crank-pin, oil-holes being drilled from the top of the disk downward into each of the crank-pin hearings in the disk; 19, a driver consisting of a disk disposed above disk 18 and having a shank fitting the usual drill-socket of the drillingmachine; 20, a crank-pin formed on or secured in the lower end of driver 19, this crank-pin engaging a bearing in disk 18 and having a throw equal to that of cranks 17 on the drilling-spindles, a cotter in the lower end of crank-pin 20 serving to unite disk 18 to the driver; 21, a circular series of balls disposed in a groove in the. upper surface of disk 18 and engaging under a collar on crank-pin 20; 22, a bushing adapted to fit within templet 1t and to fit upon the smaller end of a bicycle-hub in case the hub has one end enlarged, as is usual, to receive a sprocket-wheel, and 23 a plug secured in the disks 10 and 11 and projecting downwardly therefrom beyond templet 1i and having a diameter adapted to fit the interior of a bicycle-hub.

As the spindle of the drilling-machine turns it gives an orbital motion to disk 18 and results in the rotation of the multiple drillingspindles. As the spindle of the drilling-machine is fed downward, carrying all the drills and the templet with it, the templet engages over the larger end of the bicycle-hub and centers the hub in the attachment. The feeding motion being continued the springs 16 yield and the drills protrude through the templet and drill through the flange of the bicycle-hub. \Vhile the drilling is going on the bicycle-hub need not be clamped or held, there being no rotative tendency. lVhen the drilling is completed and the spindle of the d rilling-machine elevated, the templet leaves the hub. In drilling the other smaller end of the hub the bushing 22 may be put upon the hub to make it fill the templet. Plug 23, fitting within the bore of the hub, steadies the work and in many cases will permit bushing 22 to be dispensed with and even avoid the necessity for having the templet fit the hub.

The crank system for giving motion to the multiple drill-spindles is the preferable transmitting device and is one of great simplicity and efficiency. The thrust of the multiple drill-spindles is taken by the crank-pin bearings in disk 18 and is thence transmitted through balls 21 to the spindle of the drilling-machine.

By removing the attachment from the d rilling-machine the driver 19 with its disk 18 can be lifted from the drill-spindles and any or all of the drill-spindles can be readily withdrawn upwardly and removed from the attachment. The disks 10 and 11 and 18 and the templet 14 may have only such apertures as the spindles in immediate use require, or they may have apertures not immediately needed, and the drilling-spindles may be shifted at pleasure among the apertures, thus permitting the drilling of holes in variouslyarranged groups. In the drawings the attachment is shown as being provided with eighteen spindles to drill a complete circle of holes. One or more of these spindles may be removed from the attachment almost instantly, thus fitting the attachment for drilling holes in groups, the groups being arranged in circular series, and, similarly, almost any desired disposition of holes may be provided for.

In securing the drills in their spindles the shanks of the drills are first tinned and then sweated into their spindles. A drill may be removed and a new one inserted in the spindle in a minute by holding the socket end of the spindle over a burner or blowpipe and withdrawing the drill and inserting a new one.

In Fig. 4: my attachment is illustrated in connection with that usual form of sensitive drill in which the feed is eifected by downward motion of the drill-spindle toward a stationary work-table. It is obvious that the attachment is equally applicable to that ordinary type of drilling-machines in which the feed is effected by moving the table upwardly toward the drill-spindle.

I claim as my invention- 1. In a drilling attachment, the combination, substantially as set forth, of a group of spindles with drills, a bearing structure therefor, a templet supported by said bearing structure and engaging near the ends of the drills and having a bore to fit a part of the piece to be drilled, and a bushing fitting said bore and fitting a smaller part of the work to be drilled.

2. In a drilling attachment, the combination, substantially as set forth, of a bearing structure having a socket, a group of drillspindles journaled in said bearing structure around said socket, an annular templet, and a plug engaging said socket and projecting therefrom parallel with said drill-spindles and through said templet.

3. In a drilling attachment, the combination, substantially as set forth, of a pair of separated disks or plates rigidly but separably secured in a hub or holder and having each a. central bore, drill-spindles journaled in said plates around said bore, and a plug engaging the bore of both plates and projecting parallel with the drill-spindles.

4. In a drilling attachment, the combination, substantially as set forth, of a hollow hub or holder, a plate or disk rigidly but separably secured in each end thereof, and a group of drill-spindles journaled in said plates or disks.

5. In a drilling attachment, the combination, substantially as set forth, of a housing having bearing-disks separably but rigidly connected therewith, aclamp on said housing adapted to engage a part of a drilling-machine and support said bearing structure near the end of the machine-spindle, a group of drill-spindles j ournaled in said bearing structure, and transmitting devices engaging said drill-spindles and adapted to engage said machine-spindle.

6. In a drilling attachment, the combination, substantially as set forth, of a housing adapted to have one end secured to a part of a drilling-machine, a hub carried by the free end of the housing, a bearingrigidly but separably borne Within the hub near the end ofthe spindle of the drilling-machine, a group of drill-spindles journaled in said bearing structure, and transmitting devices connecting said group of spindles With the spindle of the drilling-machine.

7. In a drilling attachment, the combination, substantially as set forth, of a housing having a split clamp and abearing structure in a common axial line, a hub inclosing and protecting said bearings, a group of drillspindles journaledin removable bearings carried by said bearing structure around said axial line, and a driver connected with said spindles and projecting in said axial line toward said split clamp.

8. In a drilling attachment, ahub or holder, a bearing-ring secured therein, drill-spindles journaled in said ring, an annular templet carried bysaid bearing-ring, and a cylindrical plug seated axially Within said ring and projecting through said templet, substantially as described.

HUGH L. WVARNER. i/Vitnessesz J. W. SEE, SAM D. FITTON, Jr. 

